android 欢迎界面的淡入效果

package com.example.spinnertest;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.Window;import android.view.WindowManager;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.view.animation.Animation.AnimationListener;public class WelcomeActivity extends Activity{@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN , WindowManager.LayoutParams. FLAG_FULLSCREEN);setContentView(R.layout.welcome_activity);final View view = findViewById(R.id.welcome_layout_id);AlphaAnimation aa = new AlphaAnimation(0.3f,1.0f);aa.setDuration(2000);view.startAnimation(aa);aa.setAnimationListener(new AnimationListener(){@Overridepublic void onAnimationEnd(Animation arg0) {Intent intent = new Intent(WelcomeActivity.this,MainActivity.class);startActivity(intent);finish();}@Overridepublic void onAnimationRepeat(Animation animation) {}@Overridepublic void onAnimationStart(Animation animation) {}});}}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/welcome_layout_id"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView         android:layout_width="match_parent"        android:layout_height="match_parent"        android:gravity="center"        android:text="Hello World"        android:textAppearance="@android:style/TextAppearance.Large"/>    </LinearLayout>

使用主题android:theme="@android:style/Theme.DeviceDefault"

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